"I simple question is, can one use the 6-38055 engine withe the 6-11332 tender?"
I do not think that the TMCC and Legacy boards can talk to each other, even though TMCC can control Legacy locos and vice-versa. I'd love to be wrong.
I assume that you have looked on daBay for an orphan tender/tender guts of similar vintage. They do show up. Maybe a similar tender/truck combo that can be "re-bodied".