Definition of a soft 17.

Hi. Is having a soft 17 comprised of an Ace and 6 the same as having a 17 comprised of an Ace, 2, 4? You would stand with a 17 comprised of an Ace, 2, 4 (totaling 17) against a dealer's 7 but hit with a soft 17 comprised of an Ace and 6 against the same dealer's 7.

In other words, is having a 17 comprised of an Ace, 2, 4, the same play as a soft 17 comprised of an Ace and 6?

I had always played a 17 comprised on an Ace as always soft, but now I know screwed up Basic Strategy.

Any help?