Thanks for asking.
If you are looking for a complete different header then as of now X Theme does not support that. You can achieve that layout using Conditional Statements but that will fall outside the scope of support we can offer. You can take a look at following articles. Please note that snippets used in following articles are conditional statements. I am also sharing resource that you can take a look to learn more about conditional statements:
Easy solution for our customers by Themeco:
In our experience we realised that customers were looking for more options in terms of designing unique and engaging headers and footers. To resolve this problem we have launched Pro Theme that comes with header and footer builder tools. Using Pro Theme header and footer builder you can design unique (global and page specific) header, footers. You can watch following video for more information:
If you would like to convert your X Theme licence to Pro Theme, please refer following tutorial for detailed instruction: