The Ruger LCR vs Smith & Wesson Bodyguard revolver size comparison image is rendered with the triggers aligned together. Based on the image you will notice they are very similar in size with the Ruger LCR being just 1/10th of an inch shorter in length.
The most distinguishable difference between the LCR and Bodyguard is the grip. The Bodyguard’s grip is much smaller than Ruger’s LCR grip. However, Ruger has offered the LCR with smaller boot grips. It is best that you check out their website for the most current model offerings and grip options.
The first image here is simply the Ruger LCR and the Smith & Wesson Bodyguard with their triggers lined up:
For the second image we threw in the Ruger LCP just in case you wanted an additional size reference: