DoDMERB vs MEPS

I just got back from AIT and am working with my schools ROTC program to do the SMP program. I’m in the midst of the DoDMERB questionnaires and am filling out all the info I provided at MEPS. If I had gone to MEPS and needed no waivers, is DoDMERB more strict when it comes to past medical history?

Additionally, is there a waiver process like on the enlisted side?