SIG 552 mags - fitment between makes

[double-0-newb]

I have read much, but still have some questions:

-Will a TM 552 mag fit without modification into a JG? G&G?
-Will a ICS 552 mag fit without modification into a TM? Into a JG? G&G?

I am aware that if one has an ICS 552, MAG or TM or JG mags will require modification, but I have seen little on the other way around....unless I am thick and am missing something obvious.

I am asking as I am seriously thinking of scratching that 552 itch (never said it was wise or logical...just an itch) and the JG 552 with electric blow back would do nicely, but mag shopping is hinging on the answers to my above questions.

Thanks!