I've never used that kind of RF antenna splitter, I only used others like this one, but usually it has a signal quality loss
Something like that it could be enoug, no need to be exactly the same.
Because it's a passive splitter, always exist a signal loss. Something splitted in two, always result two halfs. The question is, that "half" will be enough for a tuner or not.
Usually a good antenna could povide enough signal for two tuners, you should check it. If not, you could try to use a short antenna cable as possibile, or/and an RF amplifier. The beter could be to use an antenna with built in amplifier.