interchanging chart cards

I have a Garmin 421s, works fine, but a bit too small for My taste. I want to buy a Garmin either 4010 or 4210. Problem is that I

already used this years budget on a new radar, EPIRB and quite a few other safety gears. So this year I can only afford to buy a couple of charts

for the 421s that I will be needing this winter VUS 031 R and VUS 030 R.

My question is once I buy the upgraded GPS will My cards work on the new one, or will I have to buy new ones ?

Thank you in advance

MstrRig