difference between doxycycline and doxycycline hcl for chlamydia treatment

Im currently taking "doxycycline" for treatment of chlamydia. However, the pharmacist at the drugstore showed me a "doxycycline hcl" which is much cheaper. Is there a difference between "doxycycline" and "doxycycline hcl" for the treatment of chlamydia?

[mgl]

Doxycycline is available in several different salts: Doxycycline
monohydrate, doxycycline hydrochloride (hyclate), doxycycline
carrageenate, doxycycline calcium and doxycycline phosphate (fosfatex).