I know the 69A was designated S,L,LR as were most .22s of the day. I just looked at a photo of a 75 Sporter online and it was marked .22 Long Rifle. I'd think that the Target and Sporter models were chambered the same and with the same twist.

In any case, just based on the barrel marking, there is a difference between the 69A and 75.

Paul

Stupidity has its way, while its cousin, evil, runs rampant.