Question about the value of a 4700 vs 4900

I was curious about something. If you had a 4700 that you needed to sell, would you up the price to match a 4900? It's seems like they should both be the same value.

I can't remember what the difference was on these 2 IRD's ?
Is it just the UHF remote now? I tried looking, but with these 2 IRD's now discontinued I couldn't find any info. :(

Difference. That all other hardware was the same. But since the 4700s upgraded say 4900 Upgraded to differentiate them from the preconfiged 4900, that may not be true???