SamyGO

LE40B650T3W indicates that TV is CI,
LE40B650T2P indicates that TV is CI+
Thats all.

CI and CI+ might be somehow compared like HTTP and HTTPS. Both CI and CI+ use the same physical media (PCMCIA). The difference comes in function: you put DVB-CSA encrypted transport stream into CI and you get decrypted transport stream out. Now you could write this stream to storage media. Since broadcasters do not want you to save a stream without their permission, they "invented" CI+ which basically adds an encryption layer before transport stream is sent out of CI+. So you might save the stream, but you cannot view it since keys are only known to CI+ module and TV hardware.
The DVB transport stream might contain a flag (shunning flagg) which forces the TV to only let CI+ decrypt the stream. So, CI and CI+ might exist in parallel, but for valuable transmissions they might protect the stream by forcing CI+.