wheel nuts

bought some alloys for my freelander 1 , now they fit perfect but cannot get a wheel brace in to tighten them up, so took some nuts of a ford ka and they fit perfect but they are the open end nuts, looks fine to me,infact the nut recess seems to fit perfect, is there anything wrong with useing thease as they are the same thread but a smaller nut head

The problem might lay in stress placed on wheel wanting to move outwards and prevented by standard lr version. Yet when a weaker nut version involved this can allow play and possible split or fracture. Play safe and buy LR standards.

If the factory nuts don't fit. Then I'm assuming the wheels aren't factory wheels.
So if the wheels are off something other than a Freelander. You need to make sure that the wheels are rated to take the Freelander's weight. The factory wheels are rated at 560Kgs. Also you need to make sure the spigots are the correct size. If not, you run the very real of loosing a wheel. You also need to check with your insurance company as many won't insure non standard wheels, probably because of the reasons above.

Plus you need to use alloy wheel nuts on alloys and steel wheel nuts on steels

You can't use one on the other

Taper is different on the nuts and you'll have wheels off before long whilst driving

taper the same on both nuts, size is same but one ford ones openended which are better,now most alloy wheels have steel insets so you can use steel nuts in them,

You got photos of wheels and both types of nuts and photo of nuts in wheel?

I've not seen steel inserts in alloy wheels for 30 years.
You need to check the spigot size is compatible and the wheels will take the weight.