I must say that I was not overly impressed by the painting in Logroño but I don't understand much about art. I see that the summary in the Spanish Wikipedia article claims that
the artistic quality of the painting is very mediocre compared to other similar works of the same school [Michelangelo workshop] and points to poor workmanship. However, studies are still pending to determine the authorship of the painting conclusively.
I puzzled a while about the ES Wikipedia text that concerns the fact that the kneeling female figure was added later and was included in a forced manner, breaking the symmetry of the genitalia until it dawned on me that this was also the work of a presumably juvenile Wikipedia editor and that the unaltered text had said that the added kneeling figure disturbs the symmetry of the scene. Pity that nobody bothers to reverse this 'editorial' stupidity ...
Here's some more interesting background: In 2011, a painting came to global attention that has a striking similarity to the Logroño painting and is now on display in a museum in Oxford:
A respected Italian art scholar claims to have identified a previously unknown painting by Michelangelo at the University of Oxford.
www.independent.co.uk
An article on a La Rioja (Logroño) website, also from 2011, mentions José Manuel Ramírez, who has a background in art history and published a book in 1977 where he defended the Logroño painting as the one and only original by Michelangelo. There are at least two other people who claim that they themselves have the original Michelangelo painting with this theme in their possession. Preparatory studies (drawings) by Michelangelo are owned by the British Museum and the Louvre.
Un estudioso italiano atribuye a Buonarroti un 'Calvario' existente en Oxford considerado una copia El experto riojano José Manuel Ramírez sostiene desde hace décadas que el original y único documentado es el expuesto en La Redonda
www.larioja.com