What happens with most kits is the AA% of the hops changes from crop to crop and the kit calls for the same amount of hops regardless of the AA%. This means that the IBUs will vary depending on the hops. You may or may not need more hops to brew the kit to your taste. You won't know what bitterness level to expect until you receive the kit and see the AA% on the hop packaging.
If you have brewing software, you can enter the kit ingredients and your process to get an idea of what to expect. If not, it's a shot in the dark.