Howdy Guys,
Gee, many thx for asking the question baron.

This is one of those subjects I just love!
I've used a decent amount of the 'craft paints', and have repeatedly endorsed them here on this site and others. So, I'll give my Farthing's worth on the subject.
To begin, unfortunately there is no 'cross-reference' chart available for these 'non-related' acrylic paints. But, there is such a plethora of colours available that all you need to do is start with a basic colour you are looking to replicate, say, german dunkelgelb, grab a bottle of Apple Barrel 'King's Gold', begin to lighten with other colours (won't go into the lengthy descriptive), and mix and match until it looks right! Believe me, it's not a long journey.
An additional couple of points.
One; Don't beat yourself up with some crazy exact-matching game when it comes to WW II colours. Or, military colours in general. Because, (and this comes from the people who were there), there were soooooo many methods, materials, application tools, weather conditions, time parameters, surface preparation limitations, etc, etc. That
any attempt at pin-point accuracy is an exercise in self-flagulation! #:-)
Two; (somewhat based on point #One). The use of supposedly 'cheap' acrylic 'craft' paints.
I'll begin this with a Question. Have you,or anyone you know,
ever seen a military vehicle (and I'm talking about everything from Aircraft Carriers to ammo trailers) painted with the same meticulous care that you would see on a Ferrari? O.K., I'm being a little extreme right? How about a new V.W. Beetle then?...............................didn't think so.
baron, embrace the savings and invest a little time in colour-matching, you'll appreciate it in the long run! :-)
Tread.
Oh, almost forgot. Merlin brought up an excellent poiint! The 'craft' paints tend to dry a wee bit lighter than they appear 'wet', that is except for the 'greens'...they're pretty accurate.
Another thing. They AB just dandy. In fact I 'walked' a nice ultra fine camo line freehand with my AB and had nary a problem.