The air filter, oil filter and fuel filter could all be AC brand.
The A/C system does have a screen to filter crud from plugging up the orifice tube (they are in the same package). If it was plugged up, the A/C system would not be able to circulate refrigerant. You have to evacuate the system to check it, then re-seal, draw a deep vaccum for a while and then recharge the system. Short answer: don't bother unless you are already overhauling the A/C system