The RWR sounds are definitely not from the F/A-18, or the source of the sounds seem to be off. Another user indicated the sounds are from DCS, and I think that is true. Instead of using potentially copyrighted sounds, I would recommend using the sound files located at https://github.com/Lv100Latios/ALR-67-Sounds. These were created with a wave generator using a documentary/interview as a reference and are as close as possible. If you use these sounds, I recommend using the Status Change sound and not the New Aircraft so usage of AdditionalRWRSounds adds a new sound rather than using the same one. Video described above: https://youtu.be/Mn1sBfIlUjY?t=2117
Listen to the RWR sounds in game.