Can I switch the sim card from my LG to a HTC 8125?

I have a LG CU400 and I just bought a HTC 8125 that hasnt arrived yet and was wondering if they both take the same type of sim card or do I have to buy another one.

I checked both phone specification through phonescoop.Both phones have same size of sim card.If you need swap your sim card from LG to HTC phone means,your HTC phone should be unlocked one.If it's locked by specific network means,you will need to unlock your phone.You can unlock your phone by network unlock code.You can get an unlock code from your service provider or else try to buy an unlock code from any one of the online unlocking service provider like MobileUnlockSolutions.com Here you can unlock your phone at low cost.