We're under the impression that the original FlexCare+ model came with two ProResults brush heads (one standard and one compact size).
Later on it came with the ProResults Gum Care head, standard size.

Originally, those two styles of heads had bristle designs that looked pretty ordinary (similar to a regular toothbrush).
Since that time, Sonicare has redesigned both. The tufts of bristles are arranged differently. The heads look more "modern," which is why you don't equate the new version with what you had before. We'd expect the cleaning effectiveness is improved with this newer design and that's why they made the change.

For your model, no reason to buy the more expensive heads that are preceded by a letter (like "C" or "W"). Just buy the cheaper regular heads.

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