Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Yes, you can do that and people do it all of the time. The PC 3200 will drop to the PC2700 speeds. The only problem you MIGHT run into, and it's always iffy until you try it, is mismatching two different brands. Even then, the majority of the time everything works fine together.