I need to have headers report specific, I know I can inherit standard header and customize that but it becomes global header, If I inherit header in both reports it prints in one only which loads later ( later report replaces previous header). how can I have report spcific headers?
You actually have two options. The first is to create a new header template in the module reports, in the file layouts.xml (addons/report/views/layouts.xml). For example:
<img t-if="company.logo" t-att-src="'data:image/png;base64,%s' % company.logo" style="max-height: 45px;"/>
<!-- All your custom code here -->
Which you can then load in your report.
The second option is to use the header element in Odoo. Before the <div class="page"> tag you can then do this:
On the other hand, looking at your first example, I went to /usr/lib/python2.7/dist-packages/odoo/addons/report/views/layout_templates.xml and fount the templates for the odoo-supplied header and footer and used them as examples for my various customized headers and footers for my own various customized reports. Works great!