Mortar color

Hi all,

Here is one for those who have / the professionals amongst us.

I am building a retaining wall using 190(mm) h*390 l*90 w blocks, sitting on a concrete reinforced foundation. Color of the blocks is a sandstone color, similar to this:

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The wall will be 2 blocks high (390mm total), and not load bearing.

Do I need to put mortar between the levels or can I use an adhesive (liquid nails or similar).

If mortar, how can I color match it to the blocks, ie what type of cement, what type of sand, do I need a color additive etc etc.

Thanks in advance