Both the EAA Witness and Jericho 941 are based on a Tanfoglio (Italian) frame which is an "improved" version of the CZ75.
Both pistols (the EAA and Jericho) share many similar parts; such as the fire control group and slide/barrel assemblies. The only qualifier here is caliber and frame/slide length. As these change, compatability will change. AFAIK there is no equivilant to the "F" series (frame mounted safties) Jerichos imported under the Baby Eagle name.
Conversion would probably require extensive effort, as the frame has some slight differences around the hole used for the thumb saftey. The slide is also completely different, meaning you'd have to use etheir a Jericho "F" series slide or use an EAA Witness slide. Obvious procurement issues aside, the Witness slide would preclude the use of commonly available holsters. Earlier poster mentioned the trigger "pack"-- it would probably require a full on swap. BUT, I have not had both side by side to really get a good comparison look.
My suggestion would be to hunt for a Jericho. Most of them I see available are on
gunsamerica. The only other option is an EAA, which shares much of the same grip profile as the Jericho, but less weight in the muzzle. Less weight might not be a bad thing in a carry gun though.