CZ 527 - Magazine Difference in .222 and .223

[Oso Polaris]

Trying to determine if there is any difference in donor gun selected for a .20 cal conversion. Most likely candidate is used CZ 527 chambered in .223 Rem (readily available). However, if there is a difference in magazine size (suspect there is not) then I will track down a CZ 527 chambered in .222 Rem (more rare and fewer used).

1) Is there a difference in size (length) of magazine for .222 Rem and .223 Rem?

2) Is there a spacer added to rear of magazine on .222 Rem?

Thanks