ECMP for LDP over RSVP is supported (also see ECMP Support for LDP). If ECMP applies, all LSP endpoints found over the ECMP IGP path is installed in the routing table by the IGP for consideration by LDP. IGP costs to each endpoint may differ because IGP selects the farthest endpoint per ECMP path.
LDP chooses the endpoint that is highest cost in the route entry and does further tunnel selection over those endpoints. If there are multiple endpoints with equal highest cost, then LDP considers all of them.