Bit sleep deprived, so math might be off, but at 49ohm impedance and 90dBSPL/mW the Prime needs ~100mW to reach 110dB transient peaks, and 316mW to reach 115dB peaks (with the smaller former value being a reasonable target). The Mojo looks to be putting out about ~118mW into the Primes 49ohm load, so it might be adequate, but there may be little headroom volume-wise. Depends on the listeners preferred listening volumes a bit, as well as their taste in music - classical listeners for example probably need not apply (but then they're probably not using the Prime in any case). I think it is unlikely to be ideal.
The LCD-2 in comparison is a lot more sensitive than the Primes, the current LCD-2 is not actually that demanding power wise - it only needs 8mW to reach 100dB peaks (Audeze website has its impedance at 70ohm and sensitivity at 101dbSPL/mW).
EDIT: Should add that even my math is correct above, that does assume a linear power supply, given 720 into 8ohm and 35 into 600ohm does not look like it is entirely linear (by design I would think).