Then give one of them Gust, Wing Attack or even Aerial Ace! It isn't rocket science! Rowlet's most likely getting Gust or Wing Attack due to its wings being emphasised, not its beak, which is blunt and round.
Rowlet isn't a regional bird though? It's moveset is most likely going to have a few common moves-as every other freaking Pokémon of the same type does, FYI-but completely differing due to one being Grass-Type and the other not being Grass-Type. Your problem is, you're comparing regional birds, who all have the same type except Talonflame, not regional birds and then other, non-normal birds.
Also, Normal-Type still makes it unique. It has different weaknesses than Rowlet, meaning usage in different scenarios.
And if you honestly think Rowlet and Pikipek are going to have extremely similar move sets... Pfft.
Right now they both can take on Bug, Fighting, and Grass, and are both immune to Ground, but Rowlet can also take on Rock, and Water. Now if say you give Pikipek evolution steel typing, suddenly you have a pokemon that is immune to posion types and can better handle Ice types as well. Heck if anything the Steel typing with it would improve it's usage and make it even more handy to have in different scenarios by giving it 8 resistances, 2 immunities, and reducing it's weakness down to 2.