Just tried it
The 1st 7.62 blank will sit in a smle mag but the 2nd won't seat and will just pop out....so , no it won't work.
Which rifle do you have ..the 2A or 2A1 ?
The P'07 bayo fits and other than the square mag thats about it for visual difference.
Otherwise have FUN !!! and don't let it bother you .
You can always tell the others , your a soldier from the future...lol