Hazard is a transfer that failed miserably, because Hazard was brought in at a very high price but Hazard did not have any contribution to Real Madrid. So, even if Joselu doesn't really contribute well, it won't be a problem because Joselu is an old player anyway. So yes, we cannot expect the same performance and contribution between Benzema and Joselu, because of course they have different skills and power. But anyway, at least Real Madrid have a good movement to be able to regenerate the team for the long term, because the young players that Real Madrid currently have are considered to have great potential and quality from time to time.
Joselu was brought in by Real Madrid on loan, his presence in the Real Madrid squad was only to fill the void in the vacant striker position. He is projected as a temporary alternative, Real Madrid is still hunting for another, more qualified striker to serve as a mainstay player in the main squad.
Joselu presence is not enough, Real Madrid still needs other players up front because several players who have been part of the squad have left. Karim Benzema, Marco Asensio, Mariano Diaz and Eden Hazard. Relying on Joselu is clearly impossible, Real Madrid is still trying to bring in a few more players in order to maintain the depth of their squad to compete with Barcelona in La Liga and other big clubs in the UCL.