Mishná sur Kil'ayim 7:10

A perforated pot is considered like land. If one gave terumah from [produce grown in] the soil for [produce grown in] a perforated pot, or from [produce grown in] a perforated pot for [produce grown in] the soil, his terumah is terumah. [If he gave terumah] from [produce grown in] a pot that was not perforated for [produce grown in] a pot that was perforated, [it is] terumah, but he must go back and give terumah again. [If he gave terumah] from [produce grown in] a perforated pot for [produce grown in] a pot which was not perforated, [it is] terumah, but it may not be eaten until he first gives terumah and tithes for it.