Question: substitute sublists

Is there any easy way to do subs([a,b,c]=x, [2,4,5,1,a,4,5,a,b,434,a,b,c,5,5,5,1]) = [2,4,5,1,a,4,5,a,b,434,x,5,5,5,1]

and another way to get [2,4,5,1,a,4,5,a,b,434,x,b,c,5,5,5,1]

The first subsitutes the entire match and the second substitutes when matches but only for first element.

I know I can write routines to do this and will after posting this but is there a native way that is simple?

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