All is there. One exception is Configuration API as this required c-code.
Note: C-code product and E-code product. C-code products are Corporate, Expert, Professional+ , Express+ and Essential+. E-code products are Professional and Express which Milestone no longer released since 2019 R2. C-code products and E-code products are completely different, not only products but also source code. Configuration API requires to have C-code, which means you cannot use the Configuration API for E-code products.
Important: XProtect Professional and XProtect Professional+ (PLUS) are two very different product.