How do i differntiate b/w bt HC 05 amd HC06

hey rexently i bought a bt module. the envelope it came in said it was 'HC 05' but as per my research it is HC 06. as on the back of it it has a large bluetooth sign, and other stuff thats similar to HC 06. can u tell me how do i know if its HC 05 or HC 06?

Try google, lots of answers.