Maybe they were running low on the silver old style trigger and are putting the newer style trigger in now. Still the first I've seen. Can't imagine why the other one doesn't have the chamber indicator though. I gotta get me one like that.
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They very well could have just grabbed a black trigger by mistake. As far as the other one goes, it's hard to say without pics. The 75D has a couple different configurations.
1. 75D- same as PCR, loaded chamber indicator, funky notched out rear sights, etc.
2. 75D- Same as P01, rail, standard CZ rear sight cut, etc.
3. 75D- has frame of the PCR, but the slide of the P01.
So the OP's could be like the third one, but need a pic. Would be neat to know if they thru a fourth 75D variation out there.