Hi,
thansk for your question! Welcome to the WordPress community!
Unfortunately, this is not possible. Each WordPress site uses its own database as the data storage (except if it is a so-called Multisite installation, but that might be to advanced for you at this time), and therefore each site can only access data from its own database, but not from other’s.
However, there might be a way for you that does not cause too much extra work: Just enter the table into a table on one site, and then export that table, using the integrated export functionality of TablePress. On the other site, just import that file and choose to replace the existing table (except of course when importing the table for the very first time). That way, you can have the same table on two sites quite easily.
Regards,
Tobias
