By now it should be a no-brainer that consuming plant protein powders which offer similar amino-acid levels as animal derived powders like whey protein, will similarly aid in building muscle.
Here’s a recent study that showed “no difference was obtained between the two protein groups” and “vegetable pea proteins could be used as an alternative to Whey-based dietary products”.
The study enrolled 161 males, aged 18 to 35 years old. during a 12 week resistance training period, they took a dose of 25 grams of either pea protein powder or whey protein powder, twice per day. Increases in muscle thickness and muscle strength increased with time with no statistical difference between the pea and whey groups. The placebo group, who received a fake protein powder made of maltodextrin, had significantly less muscle mass and strength, as would be expected.
Pea proteins oral supplementation promotes muscle thickness gains during resistance training: a double-blind, randomized, Placebo-controlled clinical trial vs. Whey protein.