Occam’s Razor (OR) isn’t usually applied between competing theories, but there are known examples of this also; some astrophysics mathematical equation was found by an American and was simpler (and accurate enough) than one by a Russian and so the former was/is used. Apologies for the lack of reference and specificity in the example. OR is also not an irrefutable principle of logic, or so Wikipedia says.
Ecological Psychology (EP), with both less assumptions and simpler rules guiding scientific discovery should be supported by the principle when comparing to computational theories. Even within EP, a goal is to try and find the most simple heuristic or rule-governed process for a given behaviour, maintaining the principle.
It should be said that OR has obvious issues, the foremost perhaps being that it does not guarantee truth (considered using “truthiness” here.. pass for now..) or correctness. It just says that the simpler explanation is more often the likely case.
Accepting that computationalism doesn’t really provide an explanation of the human condition, or at least that it does a worse job than EP, then we can be (at the very least, temporarily) justified to rely on EP based on this logical principle instead of computationalism.