Older answer. It’s a mistake. We provided all the original sound effects to the sound department on the series, but the editors there didn’t know which sounds went with which creatures. Production was moving so fast, some of the early shows got the wrong sounds put in, like the sick Graboid sound from T-2 being applied to El Blnaco.
Newer answer. This is a clever one we got from a fan who is trying to expand the rules of the Tremors universe: El Blanco has lived MUCH longer than any previously known Graboid due to his inability to metamorphose into Shriekers. Even so, as he ages, he might logically begin making some of the Graboid sounds that lead up to metamorphosis, even though the doesn’t actually change. It’s like an old age sort of thing.
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