Vlookup with tolerance

See attached sheet for info. (excel 2007) sheet 611 for reference.

I am working with gas chromatography and the data I get is in the form of
Retention Time (RT) and Area
RT Area
G12 H12

I need to compare the retention time from the sample to the calibration (A8,B8)

There is a slight variation in the retention time from the sample to the calibration. So, there needs to be some sort of tolerance. (this is why vlookup doesnt work)

How would I go about having a function that essentially searches the the calibration retention time for a retention with in the tolerance of the sample value. Then place both the retention time and the area in columns C and D

for example
G16 = 25.529 and matches with B21 (25.535)
I would then want the value 25.529 and 2883.279 placed in columns C and D

Thank you in advance for anything that you can help me with.

The A and B are pretty sacred (lab group standard)

The sample data is very flexible (imported by group)

I uploaded another sheet for further clarification.

The names are flexible (i could make them match the column headings for the sample)
the rows are highly variable for the samples but the A B C table is constant

Is this possible? If it is possible, i would save 100s of hours manually collecting data.

The hope would be that I could place the function in col C and it would pull all the data from the K/L column

some thing to the effect of C24 =vlookup(B24,$K$7:$L$9,1,false) Then copied cell from C24 to C43
But the issue is the values in the K column will almost never exactly equal the B column and any rounding will give me issues.

to the effect of

adding a tolerance on the search of vlookup where it would return the "1" if the value in the table was found in the range "B24+tolerance, B24-tolerance".

To answer your question, the goal is to map all k/l that are only a tolerance away from a B value