From the various pub'ed sources I've seen, while there were all kinds of He219 concepts being drawn up, the actual number of types built appeared to have been very limited. Mostly due to engines. Depending on who's figures you want to go with, the number of actual '419s built vary from zero to three (and three might be only a number of airframes allocated, and not nessiarily built). Simularly, the various '219B and 'C versions may have had metal cut form them, but as they were dependent on Jumo222s to get the performance expected, the few 'B machines were mostly flown with Jumo 213 or DB 603 and would not have done all that well. It appears only a couple or so A/B test machines ever got flight ready Jumo222s and the '219C was likely never really finished. Similarly, the Hu211 (which was considering both Ju388 and He219 fuselages, the photo is of the former) never got beyond some sets of wings, never fitted to anything before being destroyed.
There were other big wing He219 projects, the 'E would have had an even larger wing than the Hu211, and there was consideration of several high altitude DB engines with all kinds of extra boosting.
The He319 was a project entirely unrelated to the '219, only having the number sequence in common.