No, You can not Take Export from SCN, it only for upto date/SCN
you can also check the Option from here :Migration Of An Oracle Database Across OS Platforms (Generic Platform) (Doc ID 733205.1)
It is quite likely that your export may fail to create a read consistent image of the data as of the SCN specified when it is attempting to export that volume of data, with transactions running concurrently.
Since SPARC Solaris is Big-Endian and Intel Linux is Little-Endian, you'd have to convert the datafiles.
Hemant K Chitale