Uriah Heep was a bad imitation of DP, as far as I was concerned. The thing is, with your question, there have been plenty of Zep wannabes through the years(including, ironically, Coverdale/Page), so it would appear that they would have more to offer in the first place. Overall, apples and oranges, but keep in mind that while DP was around before Zep, they totally changed their musical direction in the transition between Mk I and Mk II(right after Zeppelin had arrived), especially Gillan’s screamer style vocals.
On the other hand, Yngwie took a lot from the Purps, all that ‘Bach Rock’ heavy organ, and there were other little trickles of DP influences here and there through the years….