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I'm working on a bioinformatics project where a lot of the biology I've had to learn from scratch. From my current understanding, a non-stop mutation alters a stop codon such that the transcription continues, and a splice site mutation alters the region between introns and exons - where the sequence may include introns, or remove part of the exons from cancer.gov. I'm inferring therefore that these could be the same mutation type.
Is this understanding correct?
No, those kinds of mutations are quite distinct. Also, you misstate the nature of a nonstop mutation; the change of a stop codon affects termination of translation, not transcription. This is quite different from a splice-site mutation, which affects splicing, a form of mRNA processing that occurs between transcription and translation.
