MS270 piston/crank question

[Definitive Dave]

I sold two Meteor FS480/FR480/MS270 pistons to a customer to replace worn pistons in a pair of MS270 chainsaws.
One worked flawlessly for him but the other saw has a small end of the crank that is too wide to fit the piston.

Mediacat shows two different crankshafts (ez start and regular, i believe) but only one piston.
Anyone have further insight?
I would like to get him the right piston, he says the bores match but not the small end of the crank.
I have never worked on an MS270/MS280.
I am stumped
thanks
Dave

 

[cus_deluxe]

No help here dave sorry. ASk @drf256 , i know he loves these....

 

[Chainsaw Jim]

I'm thinking it's from one of the four cylinder kit options and the different piston may only be available that way.