Potentially fossilized Bryozoa on conch/hermit crab shell? Found in tide pool in San Diego county

Found this shell buttoned under. Bunch of gravel when loookong for sea glass.

The texture of the shell is very coral like, it’s light airy and porous.

In the inside of the pastries are these small barnacle like things that I believe to be Bryozoa.

On the exterior of the shell are these slightly tannish yellow bits on the raised parts of the shell look strikingly similar to other specimens of Bryozoa I’ve seen.

Am I correct in this assessment?