Generally when making a change in volume on the same equipment, you will want to check to see which process variables will change with the volume. Things like the loss to trub, unrecoverable mash tun space, boil off rate, and brew house efficiency are the key parameters you want to look at as these tell the modeling software how to calculate your volumes through the process and how much sugars will be extracted from your grist.
The hardest one to determine will probably be the brew house efficiency. You can probably estimate that if you know what you normally get at the 10 gal level, by scaling it according to the process losses (more losses = lower BHE) and that will give you a good initial approximation.
If the key parameters are the same and you will reach the same BHE, then you are pretty well set to use the profile you have for the 10-gal batch.
Also note, the stock profiles are generally in the ball park, but your system may run slightly different. If you go by etched markings on the equipment, make sure you check their accuracy before relying on them too much. Each system will probably be close to the stock profile, but individual practices, differences in grind of the grist, and slight variations in manufacturing of the equipment can result in differences between how your system actually performs versus the stock profile. It is always recommended to make sure that the profile is reflective of the actual values you obtain for all the variables entered in the equipment profile. Often this is done by brewing batches and taking careful measurements and notes to calculate the actual values versus the estimated ones in the profile.
