68/69 Charger A/C question

Hi posting for a friend. Has the above car and doing complete restoration and now it's dash time. Noticed the fan switch was melted. It's a two speed switch. My RR is a three speed switch ( non a/c ) what's the difference between the a/c and non a/c as far as speeds? He's having issues finding a two speed switch but finds a lot of three speed ones. Can the three non a/c be used in replace of the two? Thanks in advance Rick

short answer, No.

AC wiring is different from non ac.

Ok thanks for the replie brother and will let him know.