Probably over a year ago as I was wondering about the Me410's high wingloading and how its stall speed and hence "manevuvering envelope" would compare to the aircraft already in AH. At the time there was a very nice website (
www.worldofkrauss.com) with very nice plots and data on a huge number of airfoils including the airfoils to which the foils of both Mosquito and Me410 are based. Unfortunately, the website is at least currently offline and I can't double check or link the to the data I used. From those, I calculated the theoretical stall speeds at sea level for both using 50% fuel/stardard loadout weights. I arrived to figures that are almost identical which is 119.3mph for both aircraft.
Now I tested both Mosquito and Me410 in game using these weights. I did power-off stalls at 500ft by trimming the plane by hand using the speed where the shaking/buffet starts as the indication that the aircraft has entered into a stall. This is assumption is based on Hitech's comment on the stall buffet in AH. Everything here was done with aircraft in clean configuration as the lift coefficients of 1.10 for the Mosquito and 1.42 for the Me410 where obtained from the data (
www.worldofkrauss.com). In my tests I noticed that the Me410 stalls practically exactly where I thought it would , at 120mph. However, Mosquito stalled at 107mph, roughly at 13mph lower speed than I had expected. I calculated using "theoretical altitude" of 0ft. The air density difference of 500ft adds ~2mph to the stall speed.
So HTC's modelling seems to agree with my calculation as far as the Me410 is concerned and Mosquito's Pilot's Notes seem to roughly agree as far as Mosquito is concerned. Weight with 50% fuel for the Mosquito is 18463lbs in game. In Mosquito's pilot's notes a stall speed of 105 knots (120.8mph) at sea level with 18000lbs weight is given. The weight of the Mosquito with 50% fuel in AH is 18463lbs. So based on that, the stall speed should have been slightly higher than what the Pilot's Notes mention but instead, it's clearly lower at 107mph in AH when the 500ft of altitude and 463lbs of weight should increase it, not decrease.
The relevant bit from the Mosquito's Pilot's Notes:

P.S. I know my explanation could have been a lot clearer but I just wanted to get this out here. It does contain the data though.