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@deleted
right, all the modern mechs I have are marked as both regular and compact compatible. Drop from center of braze-on bolt to bottom of front face plate is 40mm. from center of braze-on bolt to bottom of the clamping area is 17mm.
the old mech I have that isn't designed to be compact compatible has a drop of 45mm from center of braze-on bolt to bottom of front face plate. from center of braze-on bolt to bottom of clamping area is 17mm.
As Scilly suggests, the difference is in a deeper rear-plate, an older style mech actually has a 5mm advantage for your needs, although I'm wondering if it would be the same if you were looking at touring/mtb or cx mechs that would be designed to go even lower, say 46t?