None that i've heard of though the Leica 1600 does almost exactly the same thing as the 1600-B, but only gives a firing solution to 550 yds where as the B model will go to 880 yds. The Leica 1600 is no longer made.
The 1600 and 1600-B don't actually have ballistic computers or calculators in them. They have 12 preloaded ballistic curves wherein you pick the one closest to your rifles ballistic curve. They have charts in the back of their owner/op manual (can be downloaded from Leica's web site too) that allow for a 100, 200 or 300 yard or meter rifle zero. I typically always use a 100 yd zero but could not find a curve to match up close enough to my rifle's drops. I did discover that a 200 yd zero with curve #2 did closely mirror my rifles drops. I don't think I was more than 1/2 moa off all the way out to the 880 yd limit.
The Gunwerks has a true ballistic computer/calculator. You can input up to 5 different profiles to include G1 or G7, exact BC, velocity and zero range. It will output exact drops to the .1 moa.
One thing I did not like about my 1600-B was the drop data was given in clicks; example "57 clicks". Sorry, but under pressure my brain goes to mush if I had to head calculate. The 1600 did give out true MOA as does the Gunwerks.
Eat Top Ramen for lunch and save a bit longer for the Gunwerks. I LOVE mine!
Alan
Interesting video on what we all know is going on with automobiles