While I look at the Malayalam script, though the letters look different at the surface from the Tamil script, there is some commonality but the strike rate there is lower.
But I never bothered to seriously look into how similar they are. Until today. On a whim I looked up at Wikipedia for both Tamil and
Malayalam and they have the phoneme chart for both of them.
(This was triggered while watching that Malayalam train movie on youtube that S-P referred to in the Coffee thread.)
I thought I will post the two tables here since it is useful to have a side by side comparison. I am going to use this to see if I can make rapid progress in learning to read Malayalam.
Basically, to leverage knowledge of one to quickly learn the other. Not for any specific purpose.. Those who know both Malayalam and Tamil script
can advise me on if this is a quick and useful way for learning the script of the other language.
Also, if you can list which letters look close and how to easily get from one to the other would be useful ( some are close but not exact,
so some rules like ' turn it side ways', 'contort it a bit here' etc. is what I have in mind ). Of course, there are a lot more consonant symbols in
Malayalam than Tamil, we can not do anything about that except to learn them.
What I have observed so far is, in vowels there is a reasonably good match.
Interestingly, the first two letters of the alphabet, the 'a' and 'A' ( long 'a' ) look so complicated in Malayalam. The teachers and parents probably have one heck of a challenge teaching kids to write that first letter?
It is much like how the 'e' ( short 'e' ) is complicated in Tamil with idiyappam like overlapping curves!
And in consonants there are some close matches as well, though the exact symbols of Tamil M, Ya, Va stand for tha, dha and Kha in Malayalam
( though a variation and transformed version of the tamil symbol still works for the corresponding ones in Malayalam ).
One exercise we can use is, those who know both Malayalam and Tamil script, can write some words in Malayalam that a Tamil reader can get it without actually looking at the chart. Then we can go in to introducing a few letters that are drastically different. I think it will be fun. The two languages are so simialar that we can leverage the knowledge of one to learn the other.
Here are the two tables. The first one is for vowels and the second one is for consonants. Left is Tamil, right is Malayalam.
Vowels:

Consonants:
