Have two full baths, both baths are backed up together, so both are same distant from hot water heater. Bath one has no hot water presser, bath two is fine. Both had new fixtures about 12 months ago, so why all of the sudden bath one has no presser?

Bath one has some debris clogging the hot inlet on the mixing valve. Debris beaks loose usually from the water heater and goes to whatever fixture is open at the time. It could have benn bath #2 just as easily had that one been in use at the time the junk broke loose. One handle or two and brand would help if you need help cleaing the debris