If you're talking pre-launch, the only possibility of giving another player your titles is by transferring them as addressed here. The transferring of titles results, as far as I know, in the loss of everything associated with them; the cloak, manor/villa, coat of arms, etc. You, as the transferring player, would no longer be entitled to those pledge rewards, though the transferee would. This means that, come exposition, your pledge will basically look the same as anyone at the gentry level and the process when it comes to choosing families/land will be the same.
So, if the idea is to retain those assets, you could always have the other individual give them to you in game, (the land, clothing, and so on) or try and merge your towns in-game, but there's nothing mechanically–that I know of–that will differentiate you as a prior mayor pledge as opposed to a regular gentry pledge.
