Wel when i bought on secondhandmarketplace the G9 it was less then 4500 clicks and it was set to “ANA 3985” And you can change the letters each time if you like to for projects.
As a real technical guy i “never read the manual hole” only the things i am interested in. And who is interested in file naming? 
So i changed ANA to PAK and assumed that the counter added a 0 each time it needed to. As @unchdxoly rightfully posted If you read the manual you see that the “ANA” is the same as a folder name in which 1-9999 imagefiles can be placed (well if you shoot raw plus jpeg twice 9999 files but that is besides my problem.)
The G80 uses the same structure [folder] 0001 which is _/P (depending on sRGB/AdobeRGB ) [100] and rawfile number 1-9999 after 9999 it makes a new folder {101] and start over again with 0000 and when 9999 is shot it makes [102] so it looks like its P1000001-P1009999 => P1010000(or 0001) this sééms to be one row of digits but in fact its two rows sticking together when you import the images out of the SD card to your pc importfolder and then you could get PAK4500rw2 -PAK9999RW2 and a later shot date and time but named PAK0001RW2.
its a setting in menu. So i changed the PAK to folder numbering and in order to use the digit right i resetted the camera to default folder {100] and shotnumber 0000.
Then in order to get as close as possible towards the “real” amount of shutterclicks i made twice a new folder which is 100 => 101=> 102. together with the shotnumber 0000 ( which doesnt be written you must shoot 1 image in order to see a file number so 100 0001 is the lowest count and to see after 2 new folder actions if its working an other image shot so i begin with [102] 0002 which is _1020002 aka twentie thousand and two image count.
My G80 has around _1270788 files so that’s [127] 0788 So if i blend my G80 and G9 shots i could have issues of matching filenames and a 1 overlook could be destroying files due overwriting files with the same file name. (when i go to a event with my son he uses the g80 and i use the G9. We use what’s in my selection of lenses.
Thus i bought some extra overlapping the 12-200mm oly so he could use the 100-300mm lumix and my latest lens is a 100-400mm version 1 panaleica. when he goes without me he borrows my G9 and the lenses of his choosing. mostly 12-200 and 100-400mm because both are weathersealed. but sometimes also the lumix 14-140mm dual is And all images are ingested in one desktop, mine, because well organising and editing isn’t his strongsuite ;-P. So i have a system:
import folder and i ingest images in shotdate named folders first G9 so that folder i rename shotdate “event” G9 after that i ingest the g80 files which appear in yes also shotdate named folder.. . so i rename that one also to shotdate “event” G80
So both arn’t blended in one folder. those are culled , tagged, keyworded, icpt data as where what when who and moved towards a dxo edit ready folder. on exporting out dxo i have to place a suffic as G9 or G80 so they arn’t overwriting each other.
( in theory i can put all images in one folder and still be safe as in no overwriting due same filename issue.)
didn’t i say allready a dyslect ADHD person with some autistic property’s 
Sums up my problem : Don’t read more then absolute necessary to acomplisch the goal, start to soon and too fast to see the problems ahead, and is along the way changing route inorder to get it perfect…. => result chaos and blackholes…. but as you know out of every dying(imploding) star comes a blackhole which eventualy makes a new star! 
