No, not at all. Labour’s agenda is about the furthest thing - at least, in the context of present British politics - from ‘protecting their own power over actually accomplishing anything’ in the style of the US Democrats. One of the biggest criticisms commonly levied at them at the moment - a criticism that I firmly disagree with - is that they’ve become too radical, and moved too far to the Left. Our Democrat equivalents are the aptly named Liberal Democrats, who are in essence pro-Remain Tories with some of the prejudice filed off. Very much ‘the problems are bad, but the causes… the causes are good’ in political party form.
Labour’s Brexit policy is quite simple, really. Negotiate a more sensible deal with the EU than the Tories can manage - because Labour don’t have the same ‘red lines’ over immigration or what have you, and so are much more open to ‘softer’ Brexit options - and then put that deal to a new referendum with Remain, within six months of coming to power.