How to show custom fields value of two posts on one page, like comparison?

I ‘ve created products specification table for gadgets at https://thedripple.com/products. I’ve created a fixed table WP- Table reloaded with first column fixed and the value of second column are displayed by custom fields on post. Now, I wan’t to enable comparison of post (only custom fields).

For example – Users come to the site an select which two posts he wan’t to compare and after comparison get the id of post and show custom fields according to selected posts in column 2 and 3 as column 1 is fixed for all posts. Check the site for more info on my project.

In short i just wan’t code to pull selected post by ID and then display custom fields of selected posts…