Below is the MFG spec I found from 4 vendors. It appears most call for 30" clearance for the cooking surface to top edge on microwave. I live in WA state called city and they told me whatever MFG recommends must be followed and if no MFG recommendation that 24" per city code.
Bottomline mircrowave will sit around 14" from the cooking surface which is too low for ot and pants to fit.
3 options comes in head to make this better;
1) Raise your cabinet higher (depends on how high looks okay)
2) Modify the smaller cabinet to make the height less so to allow more height room for the microwave
3) Just raise the smaller cabinet higher but will be out of shape seen some people doing it just a matter of ones taste.
epth, Door Open:37-1/10 in.Height:16-7/16 in.Weight, Shipping (Approx.):55 lbs.Depth:15-3/8 in.Maximum Width:29-15/16 in.Turntable Diameter:12-3/4 in.
Cutouts:Top Edge from Cooking Surface:30 in. min
.Height, Opening:16-1/2 in.Depth, Opening:13 in.Width, Opening:30 in.