The LED's that I used in the snap kit are 3mm, they have a 2.2V forward voltage. These LED's are yellow or amber in color.
I don't have warm whites in this size. But I do for the one you sent me! (See the video)
The ones you sent me are 5mm. They also have a 2.2V forward Voltage, and are the same color as the ones that I used in the snap kit.
This is the first video in the series. It does cover some of the same ground that I have already show earlier, but it also covers
How to determine the voltage on an LED
Soldering
Which color of LED should I use?
A tale of two A-wings: Part 1: Getting started