If they are anything like Samsung widgets they ONLY work on stock LG launcher. They may be patched to work elsewhere but will likely lose the functionality they have on stock.
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LG G3 LGLS990-Stock
Acer Iconia A200 Picasso_E/OmniRom Android 4.4.4 OC 1.5Ghz
Samsung Galaxy SIII SPH-L710 d2spr/CM11 Nightlies OC 1.78Ghz
HTC Evo 4G PC36000/CM7.2 OC 1.2Ghz
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Samsung Gravity Smart T589/Stock Rooted
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HTC Sensation 4G TMOUS/CM7.2 OC 1.9Ghz
Huawei Ascend 2 M865/Stock Rooted
2 Sanyo Zio by Kyocera M6000/Stock Rooted OC 0.9Ghz