@Julien: Ah, yep, my fault, i somehow remained with the idea that you had the moon-saturn combo
dunno how it happened
Yes generally slow planets aren't as prominent as the personal ones, however, when they are chart rulers, dispositors, cutting planets, well-aspected, etc... they become more important and a mutual reception becomes quite helpful.
The combination in your chart is interesting if following the table of planetary exaltation degrees, but i remember this is more used in Vedic astrology. This however can't really be called mutual reception. Practically a planet has to have enough resources to help the other one out and vice-versa. Your planets are peregrine, and not that powerful. In fact, your Moon is more prominent than your saturn as the ruler of your ASC. A MR also signifies, to quote someone, "the ability to get out of something, to make a compromise to 'return to normal' ". My friend also has something similar to you in her chart:
Sun in Taurus, Venus in Aries. Can this be called mutual reception? Not exactly (well not at all seemingly), and the second one is detrimented. And maybe if she wouldn't have had the fire Venus-Mars-Jupiter grand trine combo, her relationships (she's been in quite a few up until now) might have been much less harmonious (she gets into them quite quickly, she didn't always have luck, but at least there has never been huge disappointments or violence or this kind of stuff involved, and they each helped her evolve in my point of view and she never let them influence her own life principles). So maybe in the end they might help each other more than if they weren't in each other's exaltation and domicile respectively? Debatable...
About your planets, you could have said they were in some mutual reception if Moon was in the 10th and Saturn in the 4th. You could check delineation to see if your planets might be linked in other ways such as through parallels (your moon and saturn are not furthermore). Other times you might take into consideration your Progressed natal chart too and different transits.
It is like with orbs. You might decide how powerful an aspects needs to be in order to be worth of being taken into consideration and applied to your daily life... (for example, and while i personally don't, i saw many actually choose to call 2 planets in mutual reception even without the aspect between them; or who apply more than 1.5 degrees to conjunctions with fixed stars, and so on)