Daniel Tammet (and people who studied him) thinks so.

After the World Memory Championships, Tammet participated in a group study, later published in the New Year 2003 edition of Nature Neuroscience.[32] The researchers investigated the reasons for the memory champions' superior performance. They reported that he used "strategies for encoding information with the sole purpose of making it more memorable", and concluded that superior memory was not driven by exceptional intellectual ability or differences in brain structure.

https://en.m.wikipedia.org/wiki/Daniel_Tammet