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The 993T uses rotors that measure 322x32F, 322x28R.
The regular 944T 298x28F, 299x24R.
The 944T S (M758 option) has 304x32F, 299x24R.
So if you use the 993T front calipers on the 944T S front rotors, you will have no problem. There may be a small issue with the clearancing the pad because of the diametral difference in the rotors. Tough to say, it's not that much (18mm, 9mm on radius). Worst case would be a little clearancing of the outer pad it it interferes with the hub.
I wouldn't recommend using those calipers on the regular 944T rotors, because you have the potential of overextending the caliper pistons. You can get away with it, but you have to really watch your pad thickness. You'd have to replace the pads at about when they wear down to about 80-75% of new thickness. The pad 'slider' in the caliper is only so long, and you can pop the pad off the slider if it wears down. In general, it's too much to worry about in my opinion.
If you have the 87+ 944 hubs, then the 944NA, 944T and 944T S rotors will interchange on the same hub.
Easy,
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