座 is noun, and 坐 is verb.

坐 is usually used as a verb, mean "sit". e.g. 坐下(sit down), 請坐(please sit) 座 is usually used as a noun, mean a "seat". e.g. 座位(seat), 優先座(priority seat) one sample sentence to include both words, e.g. 坐在座位上 (to sit on a seat)

"坐"is sitting, " 座" is the seat

他坐到了一个很好的座位