I’ll skip over the whole “Sun and Moon signs is only a piece of the whole” speech as I’m sure you are familiar with it. It’s good to mention because I’m forced to speak generally.
For Capricorn Moon, it will be like seeing a piece of themselves on personified for the Capricorn Sun will be able to recognize similarities between themselves and their counterpart. Familiarity makes it easier to connect with another. The question then becomes, will it last? Will, there be tension, and where does it stem from? When this happens, it’s a good idea to look into synastry to see how two charts relate to each other.