Hard to say, but the overall recommendation is if you are scheduled for an N400 interview with an I751 pending, assume it will be a combo interview and have you spouse go with you. Even if the IO does not conduct an I751 interview, it doesn’t hurt to mention that your spouse is with you, and supporting you for your N400 especially when applying based on marriage. I remember in our case, my wife applied for naturalization based on marriage with our I751 pending. She was called for an N400 interview with no mention of the I751, but I went with her regardless. The IO invited me back for a brief I751 interview where the IO had our fairly extensive I751 package in front of her. The IO asked a few questions about our marriage (nothing like a Stokes separate interview), and reviewed the I751 form, then asked if we wanted to add any additional evidence, so we gave her our latest joint tax filing information. Then I was escorted to the waiting area, and my wife continued with the N400 alone. It was fairly easy and took about 15-20 minutes total.
Of course YMMV as not all offices or IO’s are the same (ours was pre-Covid), but if you have a bonafide marriage, and your I751 package is complete with plenty of marital evidence, I would not fret. Just keep preparing for the civics test, and you should be fine.
Good Luck!