Is threshold crossing height and glide path angle the same for ALL airports and applied to ALL aircraft?
In the US, the requirements are specified in FAA Order 8260.3, United States Standard for Terminal Instrument Procedures (TERPS).  

Section 2-3 states:


  2-3. General PA Requirements. See Order 8260.19 for requirements
  related to GPA/TCH coincidence.
  a. GPA. Utilize a standard 3-degree 
  GPA where possible. GPAs greater than 3 degrees but not more than the
  maximum (table 2-1) are authorized without approval when needed to
  provide obstacle clearance or to meet simultaneous parallel approach
  standards. Other cases or GPAs less than 3 degrees require Flight
  Standards or military authority approval (USAF not applicable).
                      
  
  b. TCH. The published TCH (nearest whole foot) should accommodate the
  largest aircraft height group normally expected to use the runway and
  must not be less than the minimum or exceed the maximum TCH.   Note:
  60 feet is the maximum TCH regardless of height group.
  (1) CAT I.
  The TCH is based on achieving an acceptable wheel crossing height
  (WCH). The WCH is the difference between the TCH and the approximate
  glidepath antenna-to-wheel height (see table 2-2).
  (a) The optimum
  TCH provides a 30-foot WCH. It must provide a WCH no less than 20 feet
  or greater than 50 feet.
  (b) Displaced Threshold Considerations. The
  TCH over a displaced threshold can result in a WCH of not less than 10
  feet if the height of the glide path over the beginning of the full
  strength runway pavement suitable for landing falls within the
  minimum/maximum TCH values.
  (2) CAT II/III. The optimum TCH is 55
  feet and must be between 50 and 60 feet regardless of height group.  
  
      Note: To determine the
  minimum allowable TCH, add 20 feet to the glidepath-to-wheel height
  and to determine the maximum allowable TCH, add 50 feet to the
  glidepath-to-wheel height (not to exceed 60 feet).


So, the answer to the question is ; No, they are not all 3 degrees and 50 feet.