21 inch vs 27 regarding heat

is there difference, small or significant, in how 2 models handle or dissipate heat? in other words, cause 27 inch larger, presumably, there's more room/space inside? allow more air flow, better venting, oppose smaller 21 inch? using line of thought, 21 therefore more crammed , have less airflow?

or there 0 difference?

ask because using 27 inch @ work today special job, , running videos on day, basically, , felt never got hot.

 

all macs hot under load.

 

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