As far as prestige, it is thought that each letter grade at D1 is worth about 50 - 60% of effort, while at D2 and D3 it is worth about 10% of effort. So looking at it from the D1 coach's perspective who is jumping in late...
If an A+ D2 team has 1000 APs, 10 HVs and a CV, the equivalent for a D+ D1 team should be about 600 - 700 APs (1000/1.6), 6 HVs (10/1.6), and the CV.
For a C+ D1 team it should be about 400 - 500 APs (1000/2.2) and 4 - 5 HVs (10/2.2) and the CV
For a B+ D1 team it should be about 300 - 400 APs (1000/2.8) and 3 - 4 HVs (10/2.8) and the CV
For an A+ D1 team it should be about 250 - 300 APs (1000/3.4) and about 3 HVs and the CV. *Note there is no cap on A+ prestige so it could be considerably less if the team is an A++++ compared to just barely and A+
This is assuming preferences are equal, but preferences could change the divisor/multiplier. I have no data as to what these multipliers are. Also, HVs can be used to catch up with APs if the D1 team is starting late, but I don't know how many APs = 1 HV.
One of the things I like about 3.0 is that what used to be a pretty straight forward mathematical equation now has many more variables. In 2.0 many coaches knew going into a battle if they would win or lose (and hence the very few battles between top coaches for top recruits). In 3.0 there are so many more variables that getting to that level of certainty is going to be difficult.