the 2 ports on my 03 are slightly different size, and the hose to recharge it only fit one of them. on my 03, the low pressure one is on the same hard line as your port, but its closer to the condenser. the fat section of that hard line is in-between my 2 ports.
i saw all that to say, i assume in your case its the one on the condenser, but regardless, if you are attempting to check pressure or recharge it, the hose should only fit one of them.