Whack Arnolds said:
No, it shared alot...even its theme was almost a direct form of the Burton score.
The key word is "almost."
The opening sequence (which is not the character's leitmotif) is derivative from some of the cues of B89, but they were still different works which conveyed different ideas; there are similarities, mind you, afterall, they were both composed by the same man (Danny Elfman), but there are more than enough differences too. Furthermore, you must keep in mind that this Danny Elfman-composed score was only used for the opening sequence. The real theme (and leitmotif of Batman) of the series is composed by Shirley Walker which is vastly different. I could go on, but it may get rather trivial...
It was heavily influenced (see batmobile, catwoman, penguing, Joker's name being Jack etc.)...but it did slowly start to break away.
Let's handle these one by one. First, there's the Batmobile. The fact that both incarnations of the vehicle in B89 and BTAS are derivative from the Batmobile in the comics certainly means that they will share similar constructs. But let's take a look at them, shall we?
They're totally different designs.
Next there's Catwoman. The same issue with the Batmobile applies here. Both characters are adapted from the Catwoman in the comics, and there are bound to be some similarities. But we are thinking just in terms of appearances; the characterizations of these respective characters are totally different from the get-go. The same occurs with the Penguin; they're respective appearances are similar, but their characterizations are vastly different.
And as for "Jack Napier," as far as I know, that name has only been spoken once throughout the entire run of the DCAU (not just BTAS.) And it was some unknown Arkahm assistant who assumed or inferred it was his name. It's commonly understood among the fans of the DCAU that the name is just one possibility in the long list of mysteries of The Joker. Again, though, the characterizations are vastly different.
BTAS was very different from the Burton franchise from the start.