I ran KZC to solve for pressure with Meranti's best track file, and the pressures spit out near peak intensity are around 10 mb lower than those given by JTWC.
System: MERANTI (16W)
Date & Time Lat/Lon Vmax Speed Mean Presssure OCI
(kt) (kt) R34 exp (act)
9/ 8/2016 18Z: 13.2N 143.8W 20, 5, 0, 1006 (1005), 1006
9/ 9/2016 0Z: 13.6N 143.2W 25, 7, 0, 1005 (1004), 1006
9/ 9/2016 6Z: 14.3N 142.5W 25, 10, 0, 1005 (1004), 1006
9/ 9/2016 12Z: 14.6N 141.7W 25, 8, 0, 1005 (1004), 1006
9/ 9/2016 18Z: 14.7N 141.0W 30, 7, 0, 1003 (1001), 1006
9/10/2016 0Z: 14.8N 139.7W 35, 13, 50, 1002 (1000), 1006
9/10/2016 6Z: 15.0N 138.6W 40, 11, 55, 1001 ( 993), 1008
9/10/2016 12Z: 15.3N 137.6W 45, 10, 58, 996 ( 989), 1006
9/10/2016 18Z: 15.8N 136.9W 50, 8, 75, 994 ( 995), 1006
9/11/2016 0Z: 16.5N 135.8W 60, 13, 85, 989 ( 989), 1006
9/11/2016 6Z: 16.8N 134.5W 75, 13, 95, 981 ( 967), 1007
9/11/2016 12Z: 17.2N 133.0W 85, 15, 105, 972 ( 959), 1005
9/11/2016 18Z: 17.6N 131.7W 100, 13, 108, 957 ( 960), 1005
9/12/2016 0Z: 17.9N 130.3W 120, 14, 118, 939 ( 933), 1005
9/12/2016 6Z: 18.4N 129.3W 135, 11, 118, 926 ( 922), 1007
9/12/2016 12Z: 18.9N 128.1W 155, 12, 125, 906 ( 907), 1007
9/12/2016 18Z: 19.3N 126.7W 155, 14, 135, 905 ( 904), 1007
9/13/2016 0Z: 19.6N 125.5W 160, 12, 150, 898 ( 903), 1007
9/13/2016 6Z: 20.2N 124.1W 165, 14, 170, 891 ( 899), 1007
9/13/2016 12Z: 20.4N 122.9W 170, 11, 175, 884 ( 895), 1007
9/13/2016 18Z: 20.8N 121.8W 165, 11, 182, 886 ( 899), 1005
9/14/2016 0Z: 21.5N 120.8W 155, 12, 185, 899 ( 900), 1006
9/14/2016 6Z: 22.6N 119.8W 125, 14, 185, 930 ( 929), 1006
9/14/2016 12Z: 23.4N 119.0W 110, 11, 160, 944 ( 941), 1006
9/14/2016 18Z: 24.4N 118.4W 85, 11, 150, 964 ( 959), 1006
9/15/2016 0Z: 25.3N 117.6W 70, 12, 120, 974 ( 970), 1003
9/15/2016 6Z: 26.5N 116.9W 40, 14, 120, 992 ( 993), 1003
9/15/2016 12Z: 28.1N 117.1W 20, 16, 0, 1006 (1004), 1006
Of course, the actual pressures won't ever be known, but I thought it was interesting to see how far JTWC departed from them while Meranti was the most intense.