Can’t help with the 300 to 300 comparison but I can offer some comparison Yamaha F225 to Suzuki DF300APXX . Performance is apples to oranges as would be expected with the extra 75HP the Suzuki DF300APXX has over the Yamaha. What is also VERY noticeable is ease of service on the Suzuki verse the Yamaha . On Tuesday Afternoon I serviced my Suzuki water pump, thermostats, lower unit gear oil, engine oil, fuel filters, spark plugs and 8 internal zincs in about 4 hours with no swearing. Did have help installing the lower unit.
Just doing the thermostats on the Yamaha F225 was quite tedious and time consuming. Over the years I got better but first few times it took me nearly as long to do thermostats on the Yamaha F225 as it did to accomplish EVERYTHING on the Suzuki DF300APXX.
From a maintenance stand point, the layout on the Suzuki DF300APXX is quite accommodating in my shade tree wrench opinion......
We repowered our 2005 2320 with a 2020 Suzuki DF300 APX in white. Could not be happier with the upgrade in power and efficiency. Setup is a 2005 2320 with DF300 and s DF 9.9, 4 full grown men, 400 lbs of ice, overnight gear, 65 gallon bait tank, 50 gallon deck fuel bladder. We ran 90 miles offshore of Southern CA looking for bluefin. burned fuel and came back with 6 fish (6 fish approximately 150 lbs) We averaged 1.7 MPG and never had an issue getting on plane. Now when we had the F250 3.3 liter, that was an issue. Prop is a 3x17x16 stock Suzuki. We are looking to get a powertech LFS 4x14 or a 4x15. We are looking to get better MPG at lower speeds (20 to 23 kts). The Suzuki is much quieter than my buddies 4.2l F250 at idle and while cruising, not even a comparison.