Differences??

WP Simple Booking Calendar is a booking calendar for WordPress that shows when something is booked. You can set the availability and save bookings. People can’t make bookings through it from your website.

WP Booking System is a booking system for WordPress, which means your website visitors can make bookings through a form that’s shown below the calendar. You, as admin, can manage these bookings.

Thanks for your very good support!

I should have read more carefully.

You’re welcome. I’m glad it’s clear now.