saw filters?

sorry if this type of question sound so stupid. my question is, is there any way we could do on 1960mhz saw filters to work as 1842.5mhz saw filter?

You would have to change the metalization pattern by scaling all dimensions by the frequency ratio. Do you have access to IC processing equipment?

Another approach is to pay the manufacturer to make you a special filter. This would only be economical if you had large production volumes of your final product.