ELO Comparision (DE/Voobly/HD)

Hello everyone,

Apologies if this has been asked before, but have people devised a DE to Voobly ELO rating? HD was known to be roughly 600 ELO inflated over Voobly - so if you were a 2k HD player, you were 1600 on Voobly. What about DE? Is 1600 Voobly simply 1000 DE?
Also, there are roughly ~20k ranked players on DE, which is quite low for a ranked ladder, but does anyone know how much Voobly had at its peak?
Cheers!