HMD Projection Matrix to FOV Calculations

/*UE4 Reported Values from Projection Matrices

DK2
[0.92991    0         0   0]
[0          0.75097   0   0]
[???        ???       0   1]
[0          0         10  0]

CV1
[1.190342   0         0   0]
[0          0.999788  0   0]
[-0.148592  0.110690  0   1]
[0          0         10  0]

Vive
[0.756892   0         0   0]
[0          0.681268  0   0]
[-0.056316  0.003274  0   1]
[0          0         10  0]
*/

/*
Projection Matrix formulas
[s    0       0     0 ]
[0    s       0     0 ]
[0    0  -f/(f-n)   -1]
[0    0  -fn/(f-n)  0 ]

where s=1/(tan((fov/2)*pi/180))
*/

/*
google s calc formula
1/(tan((x/2)*pi/180))

google fov calc formula
arctan(1/s)*360/pi*/

Results:
hmd
hs  hfov
vs  vfov

dk2
0.92991		94.159880
0.75097		106.189099

vive
0.756892	105.756425
0.681268	111.469296

cv1
1.190342	80.066880
0.9997888	90.012102

Hey does these values still hold for Vive