Not to me. Likud is the reality we must deal with, but my main interest is New Right being in the Knesset, however minimally.
Are there any CLEAR ideological differences between Likud and The New Right? IMO it sounds more like a clash of different historic backgrounds like the two right-of-center parties in Ireland refusing to work together even though they agree on 95% of the issues. The New Right split from The Jewish Home because Jewish Home is only for Orthodox Jews but The New Right wanted to welcome secular voters into their party. Y'know... like Likud does!
I'd also compare it to the Conservative Party/UKIP split in the UK, except its reversed in Israel, with Netenyahu's government sounding more and more like a single issue "Islamofacism is bad" party. It's gotten old.
As for whether I'd endorse The New Right, it really depends on what the circumstances were in that particular district. If the Likud candidate is some RINO-like joke that has no chance of winning anyway, sure, I'd vote The New Right instead. But if the Likud candidate is a solid conservative and The New Right candidate is only polling 3% and is likely to play spoiler and pull enough conservative votes away from the Likud candidate to result in a marxist godless leftist winning the seat, forget it!