Thinking about upgrading to a Zermatt Arms TL3

Question for you all more experienced Zermatt origin owners. I currently have an Origin with a 223 proof prefit. If i wanted to change the bolt head and screw a 6.5 cm on there, How close is the zero going to be to the 223 barrel? That would be amazing if i could switch between the two with minimal POI shift until i get my second rig built.
 
I haven't swapped bolt faces yet, but I swap back and forth between a few different 6CM and 6GT barrels and it's never far off (a few clicks here or there at most).

If I was smart, I'd write down or take a couple of pics of each barrel's zero settings and I'd bet they'd return to their respective zeros with no problem (if not dead nuts, at least within a click). Since I'm not smart, and I'd have to send a few to confirm anyway... I just re-zero each time I swap, but it goes quickly, it never takes more than a few shots even without recalling the settings.
 
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