For one it would have made far more sense as a act of political violence than bombing a federal building without checking to see if the feds you want dead are all at work. For another she had far more guilt than some random ATF desk jockey in OKC since she authorized WACO directly.
So expect his reputation to not be as universally condemned.
As for other consequences it would likely have resulted in a similar level of crackdown on militia movements as happened with the aftermath of OKC bombing, but because you wouldn't have pictures of dead kids and other innocents it would likely has been far messier. It could lead instead to another OKC Bombing type of attack to take place later on, and this time ot could be something better aimed.
Overall this mean it would have been a better plan for McVeigh. Then again someone who actually thinks The Turner Diaries is a good book isn't exactly mentally sound so no surprise he ignored a good plan for a bad one. (Like seriously the book is horrible. It doesn't even make make internal sense from a neonazi/white supremacist lens. So much lf it comes off as self sabotage. It would be like a commie revolution book talking about how you need to kill workers who unionize before you kill bourgeoise.)