Probably close to good if the freewheel cogs are the same tooth counts. I said “close”, as one certainly needs to check and reset the limit screws on the rear derailleur. Most freewheels I mess with have a fair bit of variance as to the exact inner and outer cog positions relative to the derailleur. If tooth counts are different, that then brings into question chain wrap and derailleur capacity issues. As both mentioned are Shimano, you should probably have good luck with a swap.