The difference between the first 737-100 (v0.1) and the new one (v1.5) is that the first one was done at a time when the 737-100 was going to be the Base Pack and not the 737-200 which is now the Base Pack. That means that the cse731_1500exe NEEDS the csp732_1000.exe to be installed so it can set the VC and gauges up correctly.

Here is a view of the way the VC in the 737-100 uses the gauges from the 737-200:

[VCockpit01]
size_mm=2048,2048
pixel_size=2048,2048
texture=$_01
background_color=0,0,0
gauge00=..\..\CS_B737-200\panel\Captain_Sim.x737.sound!main, 1,0,1,1, Captain_Sim\737\sound.ini
gauge01=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_001, 1026, 1536, 500,500
gauge02=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_001_ndl, 1529, 1606, 105,429
gauge03=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_005, 8, 8, 500,500
gauge04=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_006, 518, 8, 500,500
gauge05=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_007, 8, 518, 500,500
gauge06=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_008, 518, 518, 500,500
gauge07=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_009, 8, 1026, 500,500
gauge08=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_010, 518, 1026, 500,500
gauge09=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_011, 8, 1536, 500,500
gauge10=..\..\CS_B737-200\panel\Captain_Sim.x737.C09!C09_012, 518, 1536, 500,500
gauge11=..\..\CS_B737-200\panel\Captain_Sim.x737.C10!C10_009, 1026, 8, 500,500
gauge12=..\..\CS_B737-200\panel\Captain_Sim.x737.C10!C10_010, 1536, 8, 500,500
gauge13=..\..\CS_B737-200\panel\Captain_Sim.x737.C10!C10_011, 1026, 518, 500,500
gauge14=..\..\CS_B737-200\panel\Captain_Sim.x737.C10!C10_012, 1536, 518, 500,500
gauge15=..\..\CS_B737-200\panel\Captain_Sim.x737.C10!C10_013, 1026, 1026, 500,500
gauge16=..\..\CS_B737-200\panel\Captain_Sim.x737.C10!C10_014, 1536, 1026, 500,500
gauge17=..\..\CS_B737-200\panel\Captain_Sim.x737.O31!O31_001, 1660, 1536, 227,121

Notice that all the VC gauges are stored in the CS_B737-200\panel folder? I can't see how it would mess that up. So I am confident it will work.

Besides. You know what to do if it does mess it up. Install the 737-100 Exterior Model and then install the 737-200 Base pack Upgrade. ;)